// 元组 数组加强类型限制
const xjj_arr: (string | number)[] = ['xjj', 23, 'sss']

const xjjTuple: [string, string, number] = ['xjj', 'g', 15]

const djjTuple: [string, string, number][] = [
  ['xjj', 'g', 15],
  ['xjj', 'g', 15],
  ['xjj', 'g', 15]
]